When creating a tunneled drawcord, here are some important points to note:
Be sure to use a negative fold angle for the folded pattern
Check that your stitches line up with the eyelet hole and do not extend the full length of the internal line
Be sure your drawcord piece grid size is set to 0.2 - 0.3
Remember to count the rounded drawcord pattern as two layers when setting the layer offset
The video below shows you how to create a flat and rounded tunneled drawcord with a clear aglet. (Note: This video was recorded using version 2023.3.)